#OTD in 1690 – Battle of the Boyne | The Jacobite forces (Irish, French, Germans and Walloons) are defeated by the Williamites (Irish, English, Dutch, Germans and Danes).

The Williamite victory, being seen as a defeat for Louis XIV, is welcomed by Pope Alexander VIII. Fought on 1 July 1690 between the forces of the deposed King James II and his successor, King William III, the Battle of the Boyne was the largest engagement ever to take place on Irish soil. While militarily indecisive, it was an event of multi-layered complexity and long-term significance, affecting the history of continental Europe, Britain and Ireland, where it continues to arouse strong feelings.

The origins of the Battle of the Boyne lay within the struggle for the crown triggered by the ‘Glorious Revolution’ of 1688. Set against a long backdrop of political and religious turmoil in England, these events saw the Catholic King James II deposed by the Protestant Stadtholder (national leader) of the Dutch United Provinces, William of Orange, who established himself on the English throne as King William III.

James fled to France, but resolved to take up the struggle again in Ireland, where he enjoyed strong backing from the majority Catholic population. His supporters were known as Jacobites, a name derived from ‘Jacobus’, the Latinised form of ‘James’.

But Ireland was to prove a bitter battleground. After a century of colonisation by English and Scottish Protestants – a process known as plantation – Ireland was deeply divided. The conflict here would also take on the character of a sectarian and ethnic civil war between native Irish Catholics and Protestant settlers of English or Scottish descent.

Furthermore, James was a key ally of the mighty French king Louis XIV, William’s long-time foe. This connection drew the battle for Ireland into a wider, European struggle. Known to history as the Nine Years War, this conflict saw William leading a multi-national coalition, the ‘Grand Alliance’, to curb Louis’s power and expansionist ambitions.

For both William and Louis, Ireland was a sideshow – a distraction from the focal point of the conflict in the Low Countries and western Germany. However, William saw more clearly than Louis the importance of winning in Ireland. Victory here would secure his succession and ensure that the resources of England would remain with the Grand Alliance, an outcome which would tip the European balance of power in his favour.

The war in Ireland began with James’s arrival in March 1689. Awaiting him was a large force of Catholic Irish raised by James’s principal commander in Ireland, Richard Talbot, 1st Earl of Tyrconnell.

They quickly secured control over much of the country including the capital, Dublin. Only in the Protestant-dominated northern towns of Derry and Enniskillen was there effective resistance to James’s takeover.

In August 1689, a Williamite army landed in Ireland to wrest back control. Commanded by Frederick, Duke of Schomberg, this force of 20,000 proved highly ineffectual, succeeding only in getting bogged down in camp at Dundalk, where many troops died from disease.

It was not until June the following year, when William himself arrived with an army of veteran Continental troops, that his campaign to reconquer Ireland could begin in earnest. After landing in Carrickfergus near Belfast, William marched south towards Dublin, joining up with Schomberg and marshalling other loyalist Protestant forces as he advanced.

Fearing the superiority of William’s army, James’s French advisors recommended that they should burn Dublin, withdraw to the west and try to hold the line of the River Shannon. However, such a strategy entailed ceding the wealthiest part of the country and would throw the Jacobites entirely onto the defensive.

Determined to fight, James disregarded this advice. Instead, he marched north to contest William’s advance along the River Boyne.

William’s army was a truly multi-national force, comprising some 37,000 men. At its core were his Dutch and Danish professionals, around 13,000 hardy and experienced troops. William also had large contingents of Huguenots (French Protestants) and Germans, with the remaining half of his army consisting of English, Scottish and Irish regiments.

While William’s army included many inexperienced units, it was a highly effective fighting force overall, being well trained and equipped, and highly motivated.

The conflict in Ireland marked a watershed in the conduct of war. New weapons and tactics were pioneered by the forces of King William, which would become the standard for European armies in the coming century.

Many of William’s men were equipped with the latest flintlock muskets. These were a significant improvement on the earlier matchlock muskets. Being simpler to use, safer and more reliable, they enabled a greater rate of fire.

The bayonet was also becoming widespread. This weapon allowed the infantryman, for the first time, to combine the roles of musketeer and pikeman. This increased both the infantry’s firepower and their protection against cavalry.

William’s Dutch units were also pioneering new platoon fire tactics, which enabled them to maintain a continuous barrage of musket fire against the enemy.

The Jacobite force, by contrast, was deficient in many ways. Numbering around 23,000 men, it was significantly smaller than William’s army. It contained some quality units, including a sizeable contingent of French professionals. But most were poorly trained and ill-equipped.

Many of its soldiers lacked firearms; the great majority of those who didn’t only had the inferior matchlock. The remainder were equipped with pikes or agricultural implements, like scythes.

The Jacobites were also considerably inferior in artillery and suffered from a general shortage of gunpowder. This disparity in firepower, compared to the Williamites, would prove to be decisive.

Only in cavalry did the Jacobites enjoy an advantage. Many of their units were drawn from the Irish Catholic gentry. These skilled and highly motivated horsemen were to make a telling contribution during the battle.

The Jacobites’ disadvantages could, perhaps, have been mitigated by good generalship. But here, again, they were to be found wanting. James and Tyrconnell both had plenty of experience of war, but neither had commanded large forces in the field. More seriously, while James had shown great courage in earlier conflicts, he now exhibited a propensity to vacillate or panic.

This was partially offset by the fact that neither William nor Schomberg were ranked among the great commanders of the age. However, they were highly experienced in handling large armies. Crucially, they also exhibited a far greater resolve than their opponents, and this was to give them the edge in the coming contest.

James’s decision to fight on the Boyne was a poor one. Fordable in many places, any defensive position here was highly vulnerable to flanking manoeuvres. This difficulty was exacerbated by the fact that the focal point of the battle was likely to be the most fordable point at Oldbridge, which lay within an exposed loop in the river. James was acutely aware of this and fear of being trapped was to dominate his conduct of the battle.

His initial deployment was to Donore Hill, a few miles to the west of Drogheda. From here, his forces could contest the Oldbridge crossing, but also pull back if required. However, James’s eye was also drawn to the west, where the threat of encirclement was greatest. As the battle opened, he had already deployed a small force to cover that flank and was preparing to re-enforce it substantially.

William did not take full advantage of the flanking opportunities presented by the Boyne position. Fearful of losing command cohesion, or of being defeated piecemeal, he dismissed an ambitious scheme suggested by Schomberg to send a large force on a wide envelopment manoeuvre to the west.

Instead, he formulated a more restricted three-pronged offensive, whereby a central thrust over the ford at Oldbridge would be supported by attacks to the east, downstream at Mill Ford, and to the west, upstream near Rosnaree. This approach would enable William to mount a powerful assault on James’s position, but reduced his chances of encircling and destroying his enemy completely.

All of William’s plans could have come to nought, however, when he was almost killed by a Jacobite cannon ball on the eve of the battle. The ball struck him on the shoulder while he was out surveying the field, probably during a picnic – a foolhardy act so close to the enemy.

The wound was a nasty one, but seemingly left the king unfazed. Indeed, he was quick to present himself to his troops to quell rumours of his untimely demise. This was to be the first of many close calls for William.

Early the next morning, William’s opening move was to dispatch his flanking force to Rosnaree. The crossing was contested vigorously, though unsuccessfully, by James’s small flank guard.

When news of this difficulty reached William, he over-reacted, sending around a third of his men as re-enforcements. The appearance of this force confirmed James’s fears of encirclement from the west. Panicking, he now led the bulk of his army, including his elite French units, to confront this threat.

Yet James’s concerns were, to a degree, misplaced. In fact, he enjoyed a considerable natural defence against William’s more limited flanking attack. Both commanders had failed to reconnoitre the ground and were unaware of a deep and marshy ravine at Roughgrange that blocked the Williamites’ line of advance.

The showdown on this flank proved to be an abortive standoff. Unable to engage, both forces would play no further part in the battle. Yet the neutralisation of so large a detachment was to prove a more serious problem for James, who had now fatally compromised his ability to contest William’s attacks elsewhere.

The main assault at Oldbridge began with a heavy bombardment of the Jacobite positions by William’s artillery. This was then followed at around 10 o’clock with an attack by his elite Dutch ‘Blue Guards’ across the river. Here, they faced the remaining Jacobite infantry who had formed a series of defensive positions in the village of Oldbridge and the surrounding hedgerows.

Weakened and demoralised by the bombardment, the poorly armed Jacobites contested the crossing with only a ragged and ineffectual musket fire. The Dutch were able to cross unhindered, form up on the other bank, and drive the Jacobites off with musket fire and bayonet charges. The Jacobite infantry made sporadic attempts to counter-attack, but these were also ineffective against the highly disciplined Guards.

Supported by the arrival of other Williamite infantry, the Dutch began to consolidate a strong defensive position. This crucial phase of the battle ended in a resounding success for William’s forces.

Battle of the Boyne | National Army Museum

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